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Multidimensional Cellular Micro-Compartments to Model Invasive Lobular Carcinoma Dormancy.

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    Area of Science:

    • Oncology
    • Cell Biology
    • Biomaterials

    Background:

    • Invasive lobular carcinoma (ILC) comprises 10-15% of breast cancer cases.
    • ILC patients face risks from cancer cell dissemination and therapy resistance, particularly to anti-estrogen treatments.
    • Late recurrences in ILC suggest a role for disseminated tumor cell dormancy.

    Purpose of the Study:

    • To investigate the link between anti-estrogen resistance and tumor cell dormancy in ILC.
    • To develop and utilize multidimensional in vitro models to study ILC characteristics and dormancy.
    • To identify mechanisms underlying ILC dormancy and anti-estrogen resistance.

    Main Methods:

    • Development of bioengineered in vitro platforms to model ILC and distinguish it from invasive ductal carcinoma.
    • Induction of a dormant phenotype in ILC cells.
    • Analysis of epigenetic changes and cellular sensing properties (chemical and mechanical) in dormant, anti-estrogen-resistant ILC cells.

    Main Results:

    • The bioengineered platforms successfully recapitulated ILC morphology, differentiating it from invasive ductal carcinoma.
    • Inducing dormancy in ILC cells led to significant epigenetic alterations.
    • Anti-estrogen-resistant ILC cells exhibited enhanced chemical and mechanical sensing of their substrate, with p27Kip1 signaling being crucial.

    Conclusions:

    • Tumor cell dormancy is linked to anti-estrogen resistance in ILC, potentially explaining late recurrences.
    • Epigenetic modifications and altered cell-substrate interactions, mediated by p27Kip1, are central to ILC dormancy.
    • The developed bioengineered platform offers a high-throughput method for studying ILC dormancy and resistance.